Bug? B4XPages - GetPage crashes if pageid does not exists

[Robert Valentino]

I am not sure if this is a Bug or Intended?

I have some pages that are only created based on options selected.

if you do a B4XPages.GetPage("Nothing") and Nothing page id does not exists B4XPages crashes

Error: page id not found: Nothing
Ids: (ArrayList) [mainpage, pplaying, pplayqueue, pplayfrom, pdatabaselist, psettings, pscreensaver]

Seems like returning a Null Page would be better or some type of command like B4XPages.DoesPageExist("Nothing")

BobVal

 

[LucaMs]

You can get if a B4XPage is "open":

Dim PageIDAdded As Boolean = B4XPages.GetManager.mStackOfPageIds.Contains("SomePageID")

 

[Erel]

This is the designed behavior.

You are expected to add all pages once when the program starts. The pages are "lazy loaded", which means that you don't need to worry about performance. B4XPage_Created will only be called when the page is first shown (unless you add pages with the sometimes useful AddPageAndCreate method).

 

[Sandman]

You are expected to add all pages once when the program starts.

I don't think I've seen that expectation anywhere before. Hence my thread a while back. So I'd suggest adding that expectation to the list in the initial B4XPages post.

 

[Erel]

It is not a forced requirement. You are required to add the page before you can get it with B4XPages.GetPage.

 

[Robert Valentino]

Understood.
I just feel that B4XPages shouldn't crash.
If it returned null and I didn't check for it and I crash that is fine.
But the umbrella that B4XPages is providing should never crash - should be bullet proof.

 

[walt61]

+1, agree with @Robert Valentino, would be good if Null would be returned